update: set test method visibility to package on JsonUrlStringBuilder

https://sonarcloud.io/project/issues?branch=update-codesmells&id=jsonurl_jsonurl-java&issues=AXLPSVPmHOMTrYIawNpP&open=AXLPSVPmHOMTrYIawNpP

https://sonarcloud.io/project/issues?branch=update-codesmells&id=jsonurl_jsonurl-java&issues=AXLPSVPmHOMTrYIawNpQ&open=AXLPSVPmHOMTrYIawNpQ

Author: dmaccormack

module/jsonurl-core/src/test/java/org/jsonurl/JsonUrlStringBuilderTest.java

@@ -104,7 +104,7 @@ void testText() throws IOException {
             "f", "fa", "fal", "fals", "False", "fAlse", "faLse", "falSe", "falsE",
             "n", "nu", "nul", "Null", "nUll", "nuLl", "nulL",
     })
-    public void testNonLiteral(String text) throws IOException {
+    void testNonLiteral(String text) throws IOException {
         testValue(text, false);
     }
 
@@ -115,11 +115,11 @@ public void testNonLiteral(String text) throws IOException {
     @ValueSource(strings = {
             "true", "false", "null", "1", "1.0", "1e3",
     })
-    public void testLiteral(String text) throws IOException {
+    void testLiteral(String text) throws IOException {
         testValue(text, true);
     }
 
-    public void testValue(String text, boolean isLiteral) throws IOException {
+    private void testValue(String text, boolean isLiteral) throws IOException {
         String expected = isLiteral ? '\'' + text + '\'' : text;
         assertEquals(text, new JsonUrlStringBuilder().addKey(text).build());
         assertEquals(expected, new JsonUrlStringBuilder().add(text).build());